A device applied to automatic drilling of a wind power flange and a use method thereof

Abstract

The application discloses a device applied to automatic drilling of a wind power flange and a use method, relates to the technical field of flange processing, and has the technical scheme as follows: a pressure bearing assembly is arranged on a base and is used for buffering axial impact load suffered during drilling of a drill bit and providing overload protection, an internal pressure bearing cavity is arranged, a leveling mechanism is arranged on a drilling feeding device and is used for adaptively adjusting an angle of the drill bit before drilling so that the drill bit is perpendicular to an inclined flange, the leveling mechanism comprises a spherical hinge, the spherical hinge is movably connected with the drilling feeding device, a telescopic rod and a leveling plate for contacting a surface of the flange are arranged on the bottom of the drilling feeding device, and the effect is that the ideal processing posture after leveling can be kept stable by resisting vibration interference during the whole drilling process, automatic leveling and locking in a pure mechanical mode are realized, high perpendicularity and position precision of hole positions are guaranteed, and the drilling precision and drilling quality are improved.

Description

Technical Field

[0001] This invention relates to the field of flange processing technology, and more specifically, to an apparatus and method for automatic drilling of wind turbine flanges. Background Technology

[0002] As a key connecting component of wind turbine towers, the accuracy of the bore diameter, the verticality of the bore, and the indexing accuracy of the group of bores directly affect the connection strength and safety reliability of the entire tower structure. These flanges are usually large ring forgings, characterized by their large weight, deep bore diameter, and large number. They are also prone to macroscopic deformation and microscopic unevenness during manufacturing, transportation, and long-term storage. Currently, the machining of bolt holes on them is generally carried out by CNC drilling machines or special drilling equipment for automated operation.

[0003] In the prior art, automated drilling devices for such workpieces typically include a base, a CNC system, an electric drive feed mechanism, and a rotary table. The standard working process is as follows: First, the CNC system controls the rotary table to perform indexing and positioning, so that the hole to be processed is turned downwards from the drill bit; then, the electric drive feed mechanism drives the drill bit to quickly approach the workpiece surface according to a preset program, and then switches to the working feed speed to drill. After drilling is completed, the drill bit quickly retracts and repeats the process for processing the next hole.

[0004] However, the above-mentioned existing technical solutions have the following technical problems in practical applications:

[0005] First, when the flange mounting surface is tilted or locally deformed due to its placement or the accumulation of drilling waste at the bottom, the rigidly connected drill bit cannot adaptively adjust the angle between its axis and the normal to the workpiece surface. This causes the drill bit's side edge to scrape violently against the workpiece at the moment of drilling, resulting in drill bit deflection, vibration, or even chipping. The ultimate consequence is that the axis of the machined hole is skewed, and the perpendicularity to the flange end face cannot be guaranteed, which seriously damages the connection accuracy and quality of the hole.

[0006] Second, when the drill bit encounters hidden hard points or impurities inside the workpiece, the sudden surge in axial resistance will be directly transmitted to the entire feed system. Although the control system can perform overload protection based on current feedback, its response is delayed, and it is very easy to cause damage to the drill bit or interruption of processing before the protection takes effect.

[0007] Therefore, in order to solve the above-mentioned technical problems, this application proposes a device and method for automatic drilling of wind turbine flanges. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a device and method for automatic drilling of wind turbine flanges.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a device for automatic drilling of wind turbine flanges, comprising:

[0010] Base;

[0011] A drilling feed device, with a drill bit at its bottom, is used to drive the drill bit to perform downward drilling operations;

[0012] The pressure-bearing component, mounted on the base, is used to buffer the axial impact load on the drill bit during drilling and to provide overload protection. It has a pressure-bearing cavity inside, in which a hydraulic damper and a pressure-bearing spring sleeved on the outside of the hydraulic damper are installed.

[0013] A leveling mechanism is provided on the drilling feed device for adaptively adjusting the angle of the drill bit before drilling so that it is perpendicular to the inclined flange. The mechanism includes a ball joint, which is movably connected to the drilling feed device. The bottom of the drilling feed device is provided with a telescopic rod for contacting the flange surface and an adjusting plate.

[0014] A fixing component is disposed between the pressure-bearing component and the drilling feed device, and is used to lock the ball joint of the leveling mechanism after leveling is completed to maintain the leveling state. It includes a fixing cavity, and a movable fixing gripper is provided in the fixing cavity.

[0015] The pressure spring is pre-compressed to a contracted state, so that under the normal drilling load of the drill bit, the pressure-bearing component and the fixing component are in a relatively rigid connection state.

[0016] The ball joint is movably disposed within the fixed cavity and can be displaced. When the leveling mechanism completes the leveling and applies axial pressure to the ball joint, the fixed gripper retracts and tightly fits against the surface of the ball joint to fix and lock it in place.

[0017] Preferably, the pressure-bearing assembly further includes a sliding plate disposed within the pressure-bearing cavity, the output end of the hydraulic damper being fixedly connected to the sliding plate, and the sliding plate forming a sliding channel with the cavity wall of the pressure-bearing cavity;

[0018] A connecting block is provided on the side of the sliding plate facing the fixing component, and the pressure-bearing component is connected to the fixing cavity through the connecting block.

[0019] Preferably, a retaining plate is provided on the front of the pressure-bearing cavity, and the surface of the retaining plate is provided with a groove that matches the movement trajectory of the connecting block, for guiding and restricting the movement of the connecting block.

[0020] Preferably, the ball joint is connected to the drilling feed device via a universal connector, which includes an upper part and a lower part. The contact portion of the upper part and the lower part is rotatably connected via a rotating shaft. The upper end of the upper part is connected to the ball joint, and the lower end of the lower part is connected to the top end of the drilling feed device.

[0021] Preferably, a guide sleeve is provided at the center of the adjusting plate, and the axial direction of the guide sleeve is coaxial with the drilling direction of the drill bit, which is used to assist in centering the drill bit during drilling.

[0022] Preferably, the fixed gripper consists of two arc-shaped clamping blocks arranged symmetrically on the left and right. Each arc-shaped clamping block includes a connecting end, a movable end, and a clamping end. The movable end is constructed as an outwardly arched arc segment, and the inner surface of the clamping end is in contact with the ball joint surface and is provided with a friction-increasing rubber layer.

[0023] Preferably, a retractable rod is further provided inside the fixed cavity, and the end of the retractable rod is rotatably connected to the connecting end of the fixed gripper;

[0024] A limiting plate is fixedly installed on the upper cavity wall of the fixed cavity, and the limiting plate is rotatably connected to the movable end of the fixed gripper to form a lever force amplification mechanism;

[0025] When the retracting rod retracts, it drives the fixed gripper to rotate around its movable end, thereby locking or releasing the ball joint at the clamping end.

[0026] Preferably, the lower end of the drilling feed device is a telescopic base, and multiple sets of telescopic rods are evenly distributed circumferentially at the bottom of the telescopic base. The lower end of the telescopic base is provided with a telescopic device for precisely controlling the feed speed and depth of the drill bit.

[0027] A method of using an automatic drilling device for wind turbine flanges includes the following steps:

[0028] S1: Start the drilling feed device and control the drill bit to perform downward drilling operation;

[0029] S2: The leveling plate of the leveling mechanism contacts the flange surface before the drill bit; if the flange surface is tilted, the leveling plate adjusts its posture under the downward pressure of the drilling feed device, tending to fit the tilted flange surface.

[0030] S3: As the leveling mechanism comes into contact with the flange surface, the drilling feed device drives the ball joint to produce a corresponding micro-displacement;

[0031] S4: The fixing gripper of the fixing component responds to the displacement of the ball joint and locks it in place. The greater the downward pressure transmitted by the drilling feed device, the stronger the locking force of the fixing gripper.

[0032] S5: After leveling and fixing are completed, the drill bit drills holes in the flange surface along the leveled axis.

[0033] S6: During the drilling process, if the drill bit encounters a hard point, causing the axial resistance to increase sharply and exceed the preset pressure of the bearing spring, the bearing spring is further compressed, and at the same time the pressure relief valve of the hydraulic damper opens to release pressure, so that the drilling feed device can maintain a constant downward pressure and continue to act on the hard point.

[0034] S7: If the drill bit still cannot penetrate the hard point after the pressure spring is compressed to its limit stroke or the hydraulic damper is depressurized for a predetermined time, the drilling feed device controls the drill bit to retract and exit the drilling state.

[0035] S8: After the drill bit retracts, the pressure spring returns to its original position, the pressure relief valve of the hydraulic damper closes, and the device returns to a state ready for the next drilling operation.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. In this invention, when the device is pressed down, the adjusting plate contacts the flange bevel before the drill bit. The reaction force generated by the bevel pushes the drilling feed device through the telescopic rod, and then transmits the torque to the ball joint through the universal connector, forcing the entire drill bit assembly to wobble slightly around the center of the ball joint. This process continues until the adjusting plate is completely in contact with the bevel. At this time, the drill bit axis is automatically adjusted to be parallel to the normal direction of the current contact point, fundamentally eliminating the scraping and deflection of the drill bit side edge caused by the bevel machining. After leveling is completed, the continuous feed force... This causes a slight upward tendency in the ball joint, which is immediately captured by the lever amplification mechanism of the fixed gripper, driving its clamping end to tighten, thereby firmly locking the ball joint in the current leveling posture. This locking force is proportional to the feed force, forming a self-amplifying effect, ensuring that the leveled ideal machining posture can resist vibration interference and remain stable throughout the drilling process. This achieves purely mechanical automatic leveling and locking, ensuring that the hole position can obtain high verticality and positional accuracy, and improving the drilling accuracy and drilling quality.

[0038] 2. In this invention, the pressure spring is pre-compressed to a preset pressure, which is slightly higher than the normal drilling resistance. During normal drilling, the spring remains stable, and the device is rigidly connected. When the drill bit encounters a hard point, the resistance increases sharply and exceeds the preset pressure. This abnormal load will immediately overcome the spring pre-compression, push the slide plate to compress the spring and move upward. The upward movement of the slide plate simultaneously drives the piston rod of the hydraulic damper to move, forcing the hydraulic oil in its cavity to flow through the throttle orifice and the pressure relief valve. The impact kinetic energy is consumed through the viscous friction of the liquid. This process can limit the maximum pressure output to the drill bit to below the safe limit. That is, most of the impact energy is absorbed by the spring deformation and hydraulic pressure relief, effectively avoiding drill bit chipping, tool breakage, or damage to transmission components caused by response lag, and providing reliable protection for the equipment. Attached Figure Description

[0039] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is a schematic diagram of a portion of the structure in this invention;

[0042] Figure 3 This is a schematic diagram of the structure of the pressure-bearing component and the fixing component in this invention;

[0043] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0044] Figure 5 This is a front view of the pressure-bearing component and the fixing component in this invention;

[0045] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0046] Figure 7 This is a schematic diagram of the pressure-bearing component and the fixing component from another perspective in this invention;

[0047] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0048] Figure 9 This is a schematic diagram of the pressure-bearing component in this invention;

[0049] Figure 10 This is a schematic diagram of the internal structure of the pressure-bearing component in this invention.

[0050] 1. Base; 2. Drilling feed device;

[0051] 3. Pressure-bearing component; 31. Pressure-bearing chamber; 32. Hydraulic damper; 33. Slide plate; 34. Pressure spring; 35. Connecting block; 36. Clamping plate; 37. Clamping slot;

[0052] 4. Fixing component; 41. Fixing cavity; 42. Retractable rod; 43. Limiting plate; 44. Fixing gripper;

[0053] 45. Ball joint; 46. Upper end piece; 47. Lower end piece; 48. Telescopic base; 49. Telescopic device; 410. Telescopic rod; 411. Adjusting plate; 412. Guide sleeve;

[0054] 5. Drill bit. Detailed Implementation

[0055] Example 1:

[0056] like Figures 1-10 As shown, the present invention provides an apparatus for automatic drilling of wind turbine flanges, comprising:

[0057] Base 1, which is the main support for the entire device, is usually fixed to the work site by anchor bolts;

[0058] The drilling feed device 2 has a drill bit 5 at its bottom, which is used to drive the drill bit 5 to perform downward drilling operations. The lower end of the drilling feed device 2 is a telescopic base 48. Multiple sets of telescopic rods 410 are evenly distributed around the bottom of the telescopic base 48. The lower end of the telescopic base 48 is provided with a telescopic device 49 for precisely controlling the feed speed and depth of the drill bit 5.

[0059] It should be noted that the telescopic device 49 is a feed control device for controlling the feed speed and depth of the drill bit 5 in the prior art;

[0060] The drilling feed device 2 and the telescopic device 49 are driven by a ball screw pair driven by a servo motor (this is the prior art). They receive the thrust from the upper pressure-bearing component 3 and convert it into the linear feed motion of the drill bit 5. The key is that its power is transmitted through a mechanism that allows it to wobble (universal connector and ball joint 45), which allows it to provide power without hindering the drill bit 5 assembly below from performing the necessary leveling action.

[0061] The pressure-bearing component 3 is set on the base 1 and is used to buffer the axial impact load on the drill bit 5 during drilling and to provide overload protection. It has a pressure-bearing chamber 31 inside, and a hydraulic damper 32 and a pressure-bearing spring 34 sleeved on the outside of the hydraulic damper 32 are installed inside the pressure-bearing chamber 31. It should be noted that the piston inside the hydraulic damper 32 divides the oil chamber into two halves, and there is an oil passage connected to the middle of the adjustable pressure relief valve.

[0062] The pressure-bearing component 3 also includes a sliding plate 33 disposed in the pressure-bearing cavity 31. The output end of the hydraulic damper 32 is fixedly connected to the sliding plate 33. The sliding plate 33 and the cavity wall of the pressure-bearing cavity 31 form a sliding channel. A connecting block 35 is disposed on the side of the sliding plate 33 facing the fixed component 4. The pressure-bearing component 3 is connected to the fixed cavity 41 through the connecting block 35. In order to further ensure the stability and guidance of the movement, a retaining plate 36 is also disposed on the front side of the pressure-bearing cavity 31. The surface of the retaining plate 36 is provided with a groove 37 that is adapted to the movement trajectory of the connecting block 35, which is used to guide and restrict the movement of the connecting block 35.

[0063] Among them, the pressure spring 34 is pre-compressed to the contracted state, so that under the normal drilling load of the drill bit 5, the pressure component 3 and the fixed component 4 are in a relatively rigid connection state.

[0064] It should be noted that the core function of this component is to sense and buffer abnormal drilling pressure, and its working principle is based on the synergistic effect of the preloaded bearing spring 34 and the hydraulic damper 32:

[0065] In this embodiment, it is stated that within the normal drilling range, the system load is less than the preload of the bearing spring 34 (F≤Fpre), the slide plate 33 remains stationary, and the entire bearing-fixed-feed transmission chain is in a rigid state, ensuring that the feed force is efficiently and without lag transmitted to the drill bit 5, thus guaranteeing processing efficiency;

[0066] When drill bit 5 encounters a hard point or abnormal load, causing the drilling pressure to momentarily exceed the preset safety threshold (F>F<preset), slide plate 33 will compress pressure spring 34 and generate upward displacement. This displacement simultaneously drives the piston rod of hydraulic damper 32 to retract. The hydraulic oil in the chamber of hydraulic damper 32 is forced to flow through the preset throttle orifice and pressure relief valve. Through the viscous friction of the liquid, the impact kinetic energy is consumed and absorbed, and the maximum pressure output to drill bit 5 is clamped below the safety limit (Fmaximum). This can effectively prevent drill bit 5 from chipping, breaking, or transmission component damage caused by sudden load changes, and achieves active protection at the first moment.

[0067] At the same time, when the drill bit 5 encounters a hard point, the pressure spring 34 has a compression displacement, and the connecting block 35 moves in the slot 37. The pressure spring 34 buffers the pressure of the drilling feed device 2 connected to the connecting block 35.

[0068] A leveling mechanism, mounted on the drilling feed device 2, is used to adaptively adjust the angle of the drill bit 5 before drilling, so that it is perpendicular to the inclined flange. It includes a ball joint 45, which is movably connected to the drilling feed device 2. The ball joint 45 and the drilling feed device 2 are connected via a universal connector, which includes an upper end member 46 and a lower end member 47. The contact portion of the upper end member 46 and the lower end member 47 is rotatably connected via a rotating shaft. The upper end of the upper end member 46 is connected to the ball joint 45, and the lower end of the lower end member 47 is connected to the top of the drilling feed device 2. The bottom of the drilling feed device 2 is provided with a telescopic rod 410 for contacting the flange surface and an adjusting plate 411. Multiple sets of telescopic rods 410 are evenly distributed circumferentially on the bottom of the telescopic base 48. A guide sleeve 412 is provided at the center of the adjusting plate 411. The axial direction of the guide sleeve 412 is coaxial with the downward drilling direction of the drill bit 5, used to assist in centering the drill bit 5 during drilling.

[0069] The ball joint 45 is movably disposed in the fixed cavity 41 and can make a slight displacement. When the leveling mechanism completes the leveling and the ball joint 45 is subjected to axial pressure and moves slightly upward, the fixed gripper retracts and fits tightly against the surface of the ball joint to fix and lock it.

[0070] It should be noted that the universal connector is essentially a composite hinge, consisting of an upper connecting rod and a lower connecting rod hinged together by a pair of orthogonally arranged precision rotating shafts. The ball joint 45 is a rotatable spherical hinge, and the ball head of the ball joint 45 can rotate slightly and float up and down within the ball seat under the action of external force. The two work together to provide two degrees of freedom for rotation around the X and Y axes, which greatly enhances the system's adaptability to complex uneven surfaces. The center of the adjusting plate 411 is inlaid with a guide sleeve 412 made of wear-resistant material. Its inner hole is in a slight clearance fit with the diameter of the drill bit 5, and its axis is coaxial with the ideal downward pressing trajectory of the drill bit 5.

[0071] The leveling mechanism is the core innovation of this invention. Its function is to automatically compensate for the form and position errors of the workpiece surface. After the device is started, the leveling plate 411 first contacts the flange surface under the drive of the feed device. If the surface is tilted, the unbalanced reaction force generated at the contact point will act on the leveling plate 411. This force pushes the entire drilling feed device 2 through the telescopic rod 410, and then transmits the torque to the ball joint 45 through the universal connector, forcing the ball head to produce a small rolling motion in the ball seat, thereby causing the entire drill bit 5 assembly to sway around the center (instantaneous rotation center) of the ball joint 45. This process continues until the leveling plate 411 is completely in contact with the inclined surface, and the axis of the drill bit 5 is automatically adjusted to be parallel to the normal direction of the current contact point, completing the fully automatic leveling.

[0072] The fixing component 4 is located between the pressure-bearing component 3 and the drilling feed device 2. It is used to lock the ball joint 45 of the leveling mechanism after leveling is completed to maintain the leveling state. It includes a fixing cavity 41. The fixing cavity 41 is provided with a movable fixing gripper 44. The fixing gripper 44 is composed of two arc-shaped clamping blocks arranged symmetrically on the left and right. Each arc-shaped clamping block includes a connecting end, a movable end and a clamping end. The movable end is constructed as an outwardly arched arc segment. The inner surface of the clamping end is in contact with the surface of the ball joint 45 and is provided with a friction-increasing rubber layer. The fixing cavity 41 is also provided with a retraction rod 42. The end of the retraction rod 42 is rotatably connected to the connecting end of the fixing gripper 44. The upper cavity wall of the fixing cavity 41 is fixedly provided with a limit plate 43. The limit plate 43 is rotatably connected to the movable end of the fixing gripper 44 to form a lever force-increasing mechanism. When the retraction rod 42 retracts, it drives the fixing gripper 44 to rotate around its movable end, thereby locking or releasing the clamping end on the ball joint 45.

[0073] The fixed gripper 44 is made of spring steel. The connecting end of each gripping block is hinged to a bidirectional retractable rod 42 via a pin, and its movable end is hinged to a limiting plate 43 fixed to the upper wall of the fixed cavity 41 via another pin. This three-point hinge structure constitutes a highly efficient lever force amplification mechanism.

[0074] It should be noted that the downward pressure continued to be applied by the drilling feed device 2 will be transmitted through the leveled drill arm, manifesting as an axial pressure on the ball head of the ball joint 45, causing it to have a slight upward displacement tendency. This slight upward displacement is immediately captured by the retraction rod 42: the retraction rod 42 maintains its position, its end is compressed and retracted, and the upward force of the ball head acts on the connecting end, and the pressure torque generated drives the clamping block to rotate around the pin at its movable end, thereby generating a strong, self-amplifying clamping action, which firmly locks the ball head in the current leveled posture. It is worth noting that the locking force is proportional to the feed force, forming a mechanical positive feedback, ensuring that the posture is more stable during the drilling process regardless of vibration. The guide sleeve 412 provides final guidance to the drill bit 5 in the early stage of its descent, ensuring that the drill tip accurately falls into the predetermined hole position starting point.

[0075] In summary, the reliable locking of the leveling posture by the fixing component 4 creates a stable, lateral-interference-free pure axial drilling environment for the drill bit 5. This not only ensures the perpendicularity of the hole, but also ensures that the load signal transmitted to the pressure-bearing component 3 is pure axial drilling pressure, greatly eliminating abnormal stress peaks caused by off-center loading. This makes the overload monitoring and protection response of the pressure-bearing component 3 more accurate and reliable, and avoids malfunctions.

[0076] The presence of the pressure-bearing component 3 provides a guarantee for the entire adaptive drilling process. Even when drilling in the most ideal leveling posture, it is impossible to fully predict the material defects inside the workpiece. The pressure-bearing component 3 ensures that even if extreme hard points are encountered after successful leveling, the system can cope with them calmly and resolve the crisis through mechanical means, thereby ensuring the ultimate realization of the leveling function value and avoiding equipment damage and production interruption.

[0077] After the device is started, the adjusting plate 411, driven by the feed device, first contacts the flange surface. If the surface is inclined, the unbalanced reaction force generated at the contact point will act on the adjusting plate 411. This force pushes the entire drilling feed device 2 through the telescopic rod 410, and then transmits the torque to the ball joint 45 through the universal connector, forcing the ball head to produce a small rolling motion in the ball seat, thereby causing the entire drill bit 5 assembly to sway around the center (instantaneous rotation center) of the ball joint 45. This process continues until the adjusting plate 411 is completely in contact with the inclined surface, and the axis of the drill bit 5 is automatically adjusted to be parallel to the normal direction of the current contact point, completing the fully automatic leveling.

[0078] Subsequently, the downward pressure applied by the drilling feed device 2 is transmitted through the leveled drill arm, manifesting as an axial pressure on the ball head of the ball joint 45, causing it to have a slight upward displacement tendency. This slight upward displacement is immediately captured by the retraction rod 42: the retraction rod 42 maintains its position, its end is compressed and retracts, and the upward force of the ball head acts on the connecting end, generating a pressure torque that drives the clamping block to rotate around the pin at its movable end, thereby generating a powerful, self-amplifying clamping action, firmly locking the ball head in the current leveled posture. It is worth noting that the clamping force is proportional to the feed force, forming a mechanical positive feedback, ensuring that the posture is more stable during the drilling process regardless of vibration. The guide sleeve 412 provides final guidance to the drill bit 5 in the early stage of its descent, ensuring that the drill tip accurately falls into the predetermined hole position starting point.

[0079] Example 2

[0080] like Figures 1-10 As shown, the present invention provides a method for using an automatic drilling device for wind turbine flanges, comprising the following steps:

[0081] S1: Start the drilling feed device 2 and control the drill bit 5 to perform downward drilling operation;

[0082] S2: The leveling plate 411 of the leveling mechanism contacts the flange surface before the drill bit 5; if the flange surface is tilted, the leveling plate 411 will adjust its posture under the downward pressure of the drilling feed device 2 and tend to fit the tilted flange surface.

[0083] S3: As the leveling mechanism adheres to the flange surface, the drilling feed device 2 drives the ball joint 45 to produce a corresponding slight displacement.

[0084] S4: The fixing gripper 44 of the fixing component 4 responds to the displacement of the ball joint 45 and locks it in place. The greater the downward pressure transmitted by the drilling feed device 2, the stronger the locking force of the fixing gripper 44.

[0085] S5: After leveling and fixing are completed, drill bit 5 drills holes in the flange surface along the leveled axis.

[0086] S6: During the drilling process, if the drill bit 5 encounters a hard point, causing the axial resistance to increase sharply and exceed the preset pressure of the pressure spring 34, the pressure spring 34 will be further compressed. At the same time, the pressure relief valve of the hydraulic damper 32 will open to release pressure, and the drilling feed device 2 will maintain a constant downward pressure and continue to act on the hard point.

[0087] S7: If the pressure spring 34 is compressed to its limit stroke or the hydraulic damper 32 is depressurized for a predetermined time and the drill bit 5 still cannot penetrate the hard point, the drilling feed device 2 controls the drill bit 5 to retract and exit the drilling state.

[0088] S8: After the drill bit 5 retracts, the pressure spring 34 returns to its original position, the pressure relief valve of the hydraulic damper 32 closes, and the device returns to a state where it can perform the next drilling operation.

[0089] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A device for automatic drilling of wind turbine flanges, characterized in that, include: Base (1); The drilling feed device (2) has a drill bit (5) at its bottom, which is used to drive the drill bit (5) to perform downward drilling operations; The pressure-bearing component (3) is set on the base (1) to buffer the axial impact load on the drill bit (5) during drilling and to provide overload protection. It has a pressure-bearing cavity (31) inside, and a hydraulic damper (32) and a pressure spring (34) sleeved on the outside of the hydraulic damper (32) are provided in the pressure-bearing cavity (31). A leveling mechanism is provided on the drilling feed device (2) for adaptively adjusting the angle of the drill bit (5) before drilling so that it is perpendicular to the inclined flange. The mechanism includes a ball joint (45) which is movably connected to the drilling feed device (2). The bottom of the drilling feed device (2) is provided with a telescopic rod (410) for contacting the flange surface and an adjusting plate (411). A fixing component (4) is disposed between the pressure-bearing component (3) and the drilling feed device (2) for locking the ball joint (45) of the leveling mechanism after leveling is completed, so as to maintain the leveling state. It includes a fixing cavity (41) and a movable fixing gripper (44) is provided in the fixing cavity (41). The pressure spring (34) is pre-compressed to a contracted state, so that under the normal drilling load of the drill bit (5), the pressure-bearing component (3) and the fixing component (4) are in a relatively rigid connection state. The ball joint (45) is movably disposed in the fixed cavity (41) and can be displaced. When the leveling mechanism completes the leveling and the ball joint (45) is subjected to axial pressure, the fixed gripper (44) retracts and fits tightly against the surface of the ball joint (45) to fix and lock it.

2. The device for automatic drilling of wind turbine flanges according to claim 1, characterized in that: The pressure-bearing component (3) also includes a sliding plate (33) disposed in the pressure-bearing cavity (31), the output end of the hydraulic damper (32) is fixedly connected to the sliding plate (33), and the sliding plate (33) and the cavity wall of the pressure-bearing cavity (31) form a sliding channel; The sliding plate (33) has a connecting block (35) on the side facing the fixing component (4), and the pressure-bearing component (3) is connected to the fixing cavity (41) through the connecting block (35).

3. The device for automatic drilling of wind turbine flanges according to claim 2, characterized in that: The front of the pressure chamber (31) is also provided with a retaining plate (36), and the surface of the retaining plate (36) is provided with a slot (37) that is adapted to the movement trajectory of the connecting block (35) to guide and restrict the movement of the connecting block (35).

4. The device for automatic drilling of wind turbine flanges according to claim 1, characterized in that: The ball joint (45) is connected to the drilling feed device (2) via a universal connector. The universal connector includes an upper part (46) and a lower part (47). The contact parts of the upper part (46) and the lower part (47) are rotatably connected by a rotating shaft. The upper end of the upper part (46) is connected to the ball joint (45), and the lower end of the lower part (47) is connected to the top end of the drilling feed device (2).

5. The device for automatic drilling of wind turbine flanges according to claim 1, characterized in that: A guide sleeve (412) is provided at the center of the adjusting plate (411). The axial direction of the guide sleeve (412) is coaxial with the downward drilling direction of the drill bit (5) and is used to assist in centering the drill bit (5) during drilling.

6. The device for automatic drilling of wind turbine flanges according to claim 1, characterized in that: The fixed gripper (44) consists of two arc-shaped clamping blocks arranged symmetrically on the left and right. Each arc-shaped clamping block includes a connecting end, a movable end and a clamping end. The movable end is constructed as an outwardly arched arc segment. The inner surface of the clamping end is attached to the surface of the ball joint (45) and is provided with a friction-increasing rubber layer.

7. The device for automatic drilling of wind turbine flanges according to claim 6, characterized in that: A retractable rod (42) is also provided inside the fixed cavity (41), and the end of the retractable rod (42) is rotatably connected to the connecting end of the fixed gripper (44). A limiting plate (43) is fixedly installed on the upper cavity wall of the fixed cavity (41). The limiting plate (43) is rotatably connected to the movable end of the fixed gripper (44) to form a lever force amplification mechanism. When the retracting rod (42) retracts, it drives the fixed gripper (44) to rotate around its movable end, thereby locking or releasing the ball joint (45) at the clamping end.

8. The device for automatic drilling of wind turbine flanges according to claim 1, characterized in that: The lower end of the drilling feed device (2) is a telescopic base (48), and multiple sets of telescopic rods (410) are evenly distributed around the bottom of the telescopic base (48). The lower end of the telescopic base (48) is provided with a telescopic device (49) for controlling the feed speed and depth of the drill bit (5).

9. A method of using the device for automatic drilling of wind turbine flanges according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Start the drilling feed device (2) and control the drill bit (5) to perform downward drilling operation; S2: The leveling plate (411) of the leveling mechanism contacts the flange surface before the drill bit (5); if the flange surface is tilted, the leveling plate (411) will adjust its posture under the downward pressure of the drilling feed device (2) and tend to fit the tilted flange surface. S3: As the leveling mechanism comes into contact with the flange surface, the drilling feed device (2) drives the ball joint (45) to produce a corresponding micro displacement; S4: The fixing gripper (44) of the fixing component (4) responds to the displacement of the ball joint (45) and locks it in place. The greater the pressure transmitted by the drilling feed device (2), the stronger the locking force of the fixing gripper (44). S5: After leveling and fixing are completed, the drill bit (5) drills holes in the flange surface along the leveled axis; S6: During the drilling process, if the drill bit (5) encounters a hard point, causing the axial resistance to increase sharply and exceed the preset pressure of the pressure spring (34), the pressure spring (34) will be further compressed, and at the same time the pressure relief valve of the hydraulic damper (32) will open to release pressure, so that the drilling feed device (2) can maintain a constant downward pressure and continue to act on the hard point. S7: If the pressure spring (34) is compressed to its limit stroke or the hydraulic damper (32) is depressurized for a predetermined time and the drill bit (5) still cannot penetrate the hard point, the drilling feed device (2) controls the drill bit (5) to retract and exit the drilling state. S8: After the drill bit (5) retracts, the pressure spring (34) resets, the pressure relief valve of the hydraulic damper (32) closes, and the device returns to a state where it can perform the next drilling operation.

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